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Finding the Fourth Proportional to 100,445.15, 150,667.72 and 78,275.12

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Solution

The fourth proportional to 100,445.15, 150,667.72 and 78,275.12 is: 117,412.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,445.15 : 150,667.72 = 78,275.12 : x
  2. Step 2: Convert to fraction form
    100,445.15/150,667.72 = 78,275.12/x
  3. Step 3: Cross multiply
    100,445.15x = 150,667.72 × 78,275.12
  4. Step 4: Simplify right side
    100,445.15x = 11,793,532,914.10
  5. Step 5: Solve for x
    x = 11,793,532,914.10/100,445.15
  6. Step 6: Final answer
    x = 117,412.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.